public void PopTest()
{
var c1 = new TestCommand("1");
var c2 = new TestCommand("2");
var c3 = new TestCommand("3");
var ch = new CommandsHistory();
ch.Push(c1);
ch.Push(c2);
ch.Push(c3);
Assert.Equal(c3, ch.Pop());
Assert.Equal(c2, ch.Pop());
Assert.Equal(c1, ch.Pop());
}
public void CantMoveForward()
{
var c1 = new TestCommand("1");
var c2 = new TestCommand("2");
var c3 = new TestCommand("3");
var ch = new CommandsHistory();
ch.Push(c1);
ch.Push(c2);
ch.Push(c3);
var moved = ch.TryMoveForward(out var actual);
Assert.False(moved);
Assert.Equal(null, actual);
}
public void ClearingUnusedItems()
{
var c1 = new TestCommand("1");
var c2 = new TestCommand("2");
var c3 = new TestCommand("3");
var c4 = new TestCommand("4");
var ch = new CommandsHistory();
ch.Push(c1);
ch.Push(c2);
ch.Push(c3);
ch.Push(c4);
ch.Pop();
ch.Pop();
ch.Pop();
ch.Push(c4);
Assert.Equal(c4, ch.Pop());
}
